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(No Model.)

G. W. STAFFORD.

COMPART BUARD FOR JAGQUARD LooMs.

. No. 669,666. Patented. sept. 6, 1687.

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SPECIFICATION forming part of Letters Patent No. 369,565, datedSeptember 6i, 1887.

Application filed December 2T, 1886. Serial No. 222.574. (No model.)

To all whom. it may concern:

Be it known that I, GEORGE W. STAFFORD, of Providence, inthe county ofProvidence and State of Rhode Island, have invented certain new anduseful Improvements in Oompart-Boards for Jacquard Looms; and I dohereby declarethat the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawings, and to theletters of reference marked thereon7 which form a part of thisspecification. Y

This invention relates to the compartboards,77 so called, used inconnection with the Jacquard devices for operating harnesses in loomsfor the purpose of dividing and properly arranging the harness-cordswith relation to the warp-threads in the loom.

These boards have been heretofore usually constructed of wood, plainboards of this material being perforated with holes arranged in shortrows across the board, the distance between the rows being such thateach row will come over a certain number of the warpthreads in the loom,and each alternate row being bored a little back, so that the holes inthe rows are opposite to the spaces in the rows on cach side of them.

The main objection to the wooden boards is that the harness-cords thatpass through them by their continual motion back and forth cut into thesides of the holes, especially those cords near the ends of the boardswhere the harness-eords leave the board at an angle in the direction ofthe Jacquard mechanism above. The friction of the grain of the wood alsofrets and wears away the cords, lengthening those toward the ends, sothat they become loose and rebound in moving up and down with aliability to produce an irregular motion of the warpvthreads controlledby them and break the harness-cords where they are attached to themail-eyes. These defects all go to lessen the speed of the mechanism,and consequently the product of the loom. These objections I overcome byconstructing the board of wires so arranged as to leave spaces betweenthem in the same order as the holes are now made in the wooden boards.

Figure 1 shows a top view `of my board.

xo Fig. 2 shows a vertical section of the board,

taken lengthwise through the line x x, Fig. 1. Fig. 3 is a view inhorizontal section of a part of my board, taken at the line c c, Fig. 2.Fig. 4 is a top view of the upper part of the same portion, Fig. 2. Thesection shown in Fig. 2 is enlarged.

a a. are strips of wood or other suitable material, through the sides ofwhich two rows of holes are made to receive two series of wires, oo,which wires extend across from one strip a to the other in a diagonalposition, the lower series of wires being inclined to the right and theupper series to the left, or vice versa, so that the two series ofwiresin crossing each other diagonally divide the space between the twostrips aa into alternating openings corresponding in general arrangementwith the holes usually made in the wooden boards.

I have made compart-boards with wires, forming square openings havingtwo sides parallel to the front of the board, but found these objectionsto them: first, the side of the square opening does not offer a steadyguide for the cord to draw in, but allows itto move back and forth as itrises and falls. This difficulty is avoided in the diagonal shape of theopening in the form of compart-board illustrated in the drawings, whichforms a corner for the cord to draw into and be guided steadily in itsmotions7 therebylessening the wear and allowing for an increase in thespeed of the loom; second, another objection to the square form is thatit is necessary to make' the board twice as wide and with twice as manyholes in each row as there are in the diagonal form. This greatlyincreases .the labor ofthreading the cords in and ofrepairing them,because of the difficulty of getting into the back cords. In opening theshed it is desirable to raise as small a length of the warp-thread aspossible, because the greater the length of thread raised the more it isstrained. In common cloth-weaving with two heddle-frames the portion ofthe thread raised to the highest point is very Small; but in theJacquard loom the warpthread in forming the shed is raised to thehighest position both at the front and back of the compart-board, sothat the wider the board is the longer will be the portion of the threadbetween the front and back that is raised to ICO the highest point. Byarranging the Wires to form a diamondshaped opening instead of a squareone, so as to place the cords alternately in the rows, the Width of theboard Will be greatly reduced and the strain on the threadsproportionally lessened; also, the time that the` threads are subjectedto the action of the cords drawing over them while passing over thecompart-board.

The sizes of the wires and also of the spaces left between them can bevaried for different sorts of goods.

Having thus described my improvement, What'I claim as my invention is- Acompart-board for Jacquard looms7 consisting of a frame with tWo seriesof wires placed diagonally across it, one of the series being placeddiagonally across the other series, substantially as shown, to form theholes for the harnesscords to pass through.A

GEO. W. STAFFORD.

Witnesses:

RUFUs S. MATTEsoN, BENJ. ARNOLD.Y

